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PA121
Two-Way Speaker System
Architects' and Engineers' Specifications
The two-way loudspeaker system shall be self-contained
and consist of the following components: (1) a 12-inch, low-
frequency driver; (2) a high-frequency section consisting of a
constant directivity horn and compression driver; (3) a two-
way crossover network; (4) a vented enclosure.
The low-frequency transducer shall be a cone type loud-
speaker having a cone diameter of at least 12 inches
(300mm). It shall have a voice coil of at least 3 inches
(76mm) in diameter. It shall present a load impedance of 8Ω.
Sensitivity shall be at least 99dB when measured at 1m with
an input of 1 Watt and have a power rating of at least 250
Watts (AES), 1000 Watts peak.
The high-frequency section shall have a compression driv-
er with a diaphragm of at least 1.75 inches (44mm) in diame-
ter. It shall present a constant impedance load of 8Ω. It shall
be connected to a constant directivity horn having a throat
diameter of at least 1 inch (25mm) and a nominal coverage
pattern of 90° horizontal by 70° vertical. Sensitivity shall be
at least 107dB when measured at 1m with an input of 1 Watt
and the power rating shall be at least 35 Watts (AES), 140
Watts peak.
The system shall be crossed over by an internal, high-
level, passive network having a response of 12dB/octave.
The nominal crossover frequency shall be 2kHz. The low-pass
section of the network shall have minimum inductance in
series with the low frequency driver. The high-pass section of
the network shall be equalized to optimize the performance
of the constant directivity horn. A dynamic high-frequency
protection circuit based on a low-value, low-mass filament
resistor shall limit the current available to the compression
driver. A connection option shall be provided to disconnect
the crossover network, but not the high-frequency protection
circuit, from the drivers to allow bi-amp operation.
Connections to the loudspeaker shall be Speakon
connectors.
The enclosure shall be a vented design with an internal
volume of at least 1.94 cu. ft. and a vent tuning of 60Hz. It
shall be constructed using 0.75 inch (19mm), void-free birch
plywood and finished with black, scratch-resistant paint. It
shall be trapezoidal shaped with 15° angled sides. A full
size, detachable, perforated steel grille, finished in black
scratch-resistant paint shall be provided. At least 12 rein-
forced threaded metal sockets (M10) for attaching mounting
www.mackieindustrial.com
16220 Wood-Red Rd. NE, Woodinville, WA 98072 USA
888.337.7404, fax 425.487.4337, industrial@mackie.com
UK
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ITALY
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GERMANY
+49.2572.96042.0, fax +49.2572.96042.10, industrial@mackie.de
(continued Architects' & Engineers' Specs)
hardware, three eye bolts and two hand-carry locations shall
also be provided. The overall dimensions of the enclosure
shall not exceed 25 x 15.12 x 15.35 inches (637mm x
384mm x 390mm).
The performance of the two-way loudspeaker system shall
be as follows: long-term power handling, at least 300 Watts
RMS; peak power handling, at least 1200 Watts; frequency
response, 100Hz–18kHz at –3dB; maximum SPL, 129dB
(anechoic–1m); sensitivity, 99dB SPL (1W/1m anechoic);
–6dB coverage, measured average 2kHz–16kHz, 90° hori-
zontal by 70° vertical. The two-way loudspeaker system shall
be a model PA121 manufactured by Mackie Industrial.
®
NL4
Electronic files for this product available at:
www.mackieindustrial.com
This Specification Sheet
Mackie Designs continually engages in research related to product improvement. New material, produc-
tion methods, and design refinements are introduced into existing products without notice as a routine
expression of that philosophy. For this reason, any current Mackie Industrial product may differ in some
respect from its published description, but will always equal or exceed the original design specifications
unless otherwise stated. © 1999-2001 Mackie Designs Inc. All rights Reserved.
registered trademarks of Mackie Designs Inc. Mackie Industrial is a trademark of Mackie Designs Inc.
PA121.PDF
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are
part no. 910-151-10 Rev.B
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